The Spatial Vectorcardiogram in Left Ventricular Hypertrophy

Abstract

The spatial vector-cardiograms in 90 subjects with left ventricular hypertrophy were recorded using the equilateral tetrahedron reference system and cathode ray oscilloscope. The configuration was usually different from the normal. Typically, the QRS sE-loop was smooth, wide and rounded, inscribed in a counterclockwise direction and placed largely to the left and above the isoelectric point in its frontal plane projection. The left sagittal plane projection of the QRS sE-loop was long, narrow and directed largely upward and posteriorly. The typical T sE-loop was small, smooth, horsehoe-shaped and counterclockwise in inscription in both frontal and left sagittal plane projections. In some instances the QRS sE-loop was similar to that of the normal but was always accompanied by an abnormal T sE-loop.